System of control.



R. C. NEWHOUSE.

SYSTEM OF CONTROL.

APPLICATION FILED MAY 9. 1912.

1 ,21 9,76 1 Patented Mar. 20, 1917.

. UNITED s A'rEs ara RAY c. NEWHOUSE, or MILWAUKEE, WISCONSIN, ASSIGNOR,BY MESNE ASSIGNMENTS,

TO ALLIS-QHALMERS MANUFACTURING COMPANY, A CORPORATION OF DELAWARE.

- SYSTEM or common Toall whom it'may concern:

, Be it known that I, RAY C. NEWHousE, a citizen. of the United States,residing at Milwaukee, in the county of Milwaukee and State ofWisconsin, have invented certainnew and useful Improvements in Systemsof Control, of which the following is a full,

clear, and exact specification.

My invention relates to electrically operated skip hoists.

It is the object of my invention to provide a skip hoist, for hoistingstone, coal, ore, etc., which is normally completely automatic in itsoperation but may be manually controlled when desired.

In attaining this object, have provided a system involving a number ofnovel features. The movement of theskips is preferably obtained by anelectric motor, and the motor is controlled by'the closing of the gateof the bin from which the' material to be mally entirely automatic, theoperator may at any time assume control and obtain any desired movementof the skips within-their limits of movement. There are'also pr'ovided anumber of safety devices.

drawings, and will be vention; a

The two skips and 11 operate on the usual Y The various novel featuresofmy invention will appear from thedescription and particularly pointedout in the. claims. p I

The single figure of the drawing shows diagrammatically one embodimentof my intrack's-12, these tracks 12 being arranged so that the skipspass each other without interferingand'yet each skin-when at the abottom. of the hoist occupies substantially the? same place as does theother skip under the-seams circumstances.

cable or cables .13 extend inthe usual man- The operating her around thewinding drum 14, and its ends are fastened to bails '15 pivoted to theskips near their rear ends, This manner of I Specification of LettersPatent.

Application filed May 9,1912. Serial No. 696,107.

-motor of the wound rotor type. .mary circuit is supplied from athree-phase The closing of the bin gate is also I manually controlledirrespective of the load in the skip. Although-the operation isnorrammed Mar. 2o; 1917.

pivoting the bails 15 allows the automatic tipping of the skips .as theyreach the top. To obtain this tipping, the rear axle of each skip isprovided with additional wheels 17, which engage the auxiliary track 18when the skip is at the top of the hoist. As a skip approaches the top,its front axle follows the curved upper end of the main track 12, whlleits rear axle follows the auxiliary track 18, the skip being thusautomatically dumped; the skip 11 is shown dumping.

The hoisting drum 14 is operated by the motor 20, preferably beingdirectly connected thereto. This motor may be of anv desired type, beingshown as an induction Its pri line 21, through a circuit-breaker 22 anda reversing switch 23. The circuit-breaker 22- is'biased to openposition, but is held in closed position by a latch 24. The latch inturn is biased to unlatching position, but 3 is held in latchingposition by a solenoid 25 located in a circuit which, under normalconditions, is always closed. The circuit of this solenoid may be calledan'emergency con-- trol circuit. .Upon the deenergization of thesolenoid 25, for any reason, the circuitbreaker 22 opens. The, reversingswitch 23 is preferably of the oil immersed, doublethrow, 'Inultipoletype, and is biased to open position. It is movable to its two closedpositions by solenoids 26 and 27 respectively.

may 'be short-circuited by switches 32, 33, 34,35, operated by solenoids36, 37, 38, and

'39 respectively. The solenoids 26, 27, 36,

37, 38, and 39 are'controlled by a manually operated master switch 40,aplurality of manually operated switches 41, a set of switches 42 to 45inclusive, automatically actuated master direction switch 54, and amanually controlled reversing switch 46.

The master switch 40 is provided for man ually. starting and stoppingthe motor and skips In closing the switch, the blade 47 first-engagescontact 48 for energizing solenoids 26 and 27 for operating the switch23 in one direction or the other. Upon further movement of the blade 47inthe same direction,said blade comes into engagement with contact 49for energizing solenoids 36, 37, 38, and 39 of the resistance Switches32, 33,

.34, and 35 respectively. By opening the master switch 40, the bladeleaves contacts master switch is to be located at some convenient point,such as at the mam operating stand.

' The manually operated switches 41 are located at various points in thecontrol system. For instance, these switches may be located on differentfloors or at points of comparatively great distance from each other.These switches 41.are adapted, when switch 40 is closed, to start andstop the operation of the whole system in the same manner as it isaccomplished by the opera.- tion of the master switch 40. The switchesare here used primarily as emergency switches for shutting down thesystem from various points if it is desired so to do for any particularreason. The switches 41 each have two movable contacts 41 and 41*, thefirst of which engages an elongated contact 41 so that when saidswitches are opened the sections of resistance controlled by the contact41 will be cut into circuit before the main line circuit is opened byseparating contacts 41 and 41. It is to be noted,

. however, that only one such switch as 40 is .shaft a ratchet w to beused, while any number of switches 41 can be employed. The reason forthis is apparent, for if two such switches as 40 were used, one could heopened and still the system would continue to operate, providing the oneremaining, closed was on the live side of the open switch.

The switches 42 to 45 inclusive are biased to their lower positions, asby gravity, but may be raised to their upper positions by a taper-endednut 58 traveling along a thread ed rod 59 driven through suitablereducing gearing from. the shaft, of the motor 20. Guides 58 prevent thenut 58 from turning. These switches are closed only in their lowerpos1t1ons. The switches 42' and 45 in their lower positions are in thecircuits of the solenolds 26 and 27 respectively. The switches 42 and 43are in circuit with ,the solenoids 36 to 39 inclusive when the motor isoperatmg 1n one dlrection, and the switches 44 and 45 are in circuitwith said solenoids when the motor is going in the opposite directlon.The switches 42 to 45 inclusive may be spaced as desired.

The master direct'on switch 54 has on its hieel 60, the number of teethofthe ratchet wheel corresponding to the number of positions of theswitch 54.

This number is an even number, the switch in alternate positions closingthe circuit of the switches 42 and 43, and 44 and 45, respectively; thusoppositely controlling the direction of operation of the motor 20. The

switch 54 is operated automatically, through the ratchet Wheel 6Q, in amanner hereinafter described.

L My present. system is also provided with the double-throw switch 46-for the purpose of manually reversing the direction of operation at anytime without regard to the'direction in which the system is operating orto the position of the skips. In other words, switch 46 when-thrown tothe position opposite to the one in which it is found changes theconnections of switch54 and switches 42 to 45 inclusive for controllingthe actions of solenoids 26 and 27 for reversing the motor 20. Whenswitch 23 is operated, auxiliary switches 26 and 27 are also operatedfor controlling the circuits of solenoids 36 to 39 inclusive of theresistance switches 32 to 35 inclusive. Thus the operation of the systemmay be manually reversed at will by merely throwing switch 46 to theposition opposite to the one in which it is found.

The motor is provided with a mechanical brake 64, cooperating with adisk 65 on the shaft of the motor 20. The brake is released by asolenoid 66 whenever current is being supplied'to the motor 20, thesolenoid 66 being connected to the motor circuit through a currenttransformer 67.

The automatic operation of the ratchet wheel 60 above referred to isobtained by a finger 68 hinged on the balance arm 69 of the gate 70 ofthe supply bin 71. The bin gate 70 is biased to closed position by anadjustable weight 72 on the balance arm 69. During the last part of theclosing movement of the bin gate 70 the finger 68 strikes one of theteeth of the ratchet wheel 60 and moves the master direction switch 54from one position tothe next. The bin gate 70 carries a pivoted'finge'r73, which is in the path of an arm.74 on the top of each skip. Thefinger 73 is biased into the path of the arm 74 by a light spring 75 andmost ofthe time is held there by a latch 76, which latter is connectedby suitable connecting mechanism to the balance beam 77 of a scale uponwhich the skip at the bottom of the hoist rests and is,released uponsa.tion of said beam. The platform of this scale consists of two parallelplates 78 and 79, the

former being mounted on the other by a nest of springs 80. On thebalance beam 77 is an adjustable weight 81 for determining nt deflec=the hoist. Immediately upon the opening of the bin gate, the stone, ore,or other material to be hoisted, begins to run from the bin 71 into theskip 10, which may be provided with a lip 82 to prevent any of thematerial from falling between the, gate and the skip. Thecircuit-breaker 22 is closed. The switch 23 is in its middle or oifposition, the traveling nut is at the extremeleft hand limit of itsmovement, holding switches 42 and 43 in their upper or open positions.The switches 45 and 46 are in their lower or closed positions. Theresistance switches 32 to 35 inclusive are inthe lower oropen positions.

To make the system operate automatically at full speed the master switch40, switches 41 and 46 should be closed, and there left while theuninterrupted automatic opera tion is to continue. As the-skiplO fills,the plate 78- of the scale platform is depressed, first compressing thesprings 80 and then engaging and depressing the plate 79 of the scaleplatform and raising the weight 81. When the load in the skip 10 reachesa pre: determined value, the tilting of the balance beam 77 releases thelatch 76, and the finger 73 momentarily swings past the arm 74 to allowthe weight 72 to close the bin gate 70.

This shuts ofi' the supply of material to the skip 10. As the bin gateapproaches its closed position, the finger 68 strikes one of the teethof the ratchet wheel 60 and moves the master direction switch 54 forwardto the next osition beyond that which it occupies. Th1s completes acontrol circuit which extends from one side of the control supply line83 through contact 84'on the switch 54, conductor 85, reversing switch46, conductor 86, switch 45,'conductor 87, solenoid 27 conductor 88,switches 41 and 40, to theother side of the line 83. The resultantenergization of coil 27 closes the switch 23 to the left, and alsocauses the closing of the auxiliary switch 27 carried by the switch 23,

thus putting the resistance switches 32 to 35 inclusive under thecontrol of the switch 44 and completing the primary circuit of the motor20 for operation in one direction. The

completion of this primary circuit energizes solenoid 66 to releasebrake 64.

The motor 20 now starts slowly, driving the winding drum 14 and the rod59; thus causing the skip 10 to-start upward, the skip 11 to startdownward, and the traveling nut.

58 to startto the right. The hinged end of the finger 73, which fingerhas been brought b ack by the spring 75 into the path of-the arm 74 andis ree'ngaged by the latch 76 as soon as the skip 10 has started u ward,allows such arm to pass without e ect as the skip 10 rises. As the nut58 moves to the right, it first allows the switch 42 to drop from itupper to its lower position, thus making a potential circuit forsolenoid 26, which at this time is open at the switch 54. As the nut 58continues its movement to the right, it allows the switch 43 to drop toits lower or closed position, thus making another potential circuit,through the switch 43, for the 1 solenoids 36 to 39 inclusive; thispotential circuit is open at the switch 54 andat the auxiliary switch'26also carried by switch 23. The droppingof the switches 42 and 43 doesnot affect the speed of the motor 20.

1 As soon as the switches 23 and 27 are closed to the lefta circuit iscompleted from one side of the control supply line 83 through contact 84of switch 54, conductor 85, re-

versing switch 46, conductor 86, switch 45, conductor 87, branching fromthe circuit of solenoid 27 and continuing through auxiliary switch 27conductor 50, switch 44, conductor 51, contact 35, conductor 100, switchsection, 28, of the resistance in the rotor circuit of the motor 20. If,however, the auxiliary switch 28 has been opened, due to excess currentin the secondary circuit when v the motor is first, started, switch 32will not be closed until the current in' the secondary circuit hasdecreased sufliciently to permit said switch 28 to close. If, whenswitch 32 is closed,-the secondary current rises above a predeterminedvalue, auxiliary switch 29 'will be opened, therebypreventing solenoid37 from being energized. At this point it is to be noted that thecontacts 102 with ,Which the resistance switch members 32,33, and 34come into contact are elongated. This is for the purpose of completingthe circuit-of the solenoid of the next auxiliary switch, such as-29permitting said switch to be opened as 33. When switches 32 and 32 areclosed v and 29 has remained closed or returned to closed position, thecircuit of the solenoid 37 is completed, resulting in the closing ofswitch 33 and the cutting out of the second section, 29, of theresistance. Similarly switches 34 and 35 are closed in turn,successively cutting out the remaining sections 30 and 31 of resistance.This vbrings the motor 20 up to full'speed.

Such full speed continues until the skip 1O approaches its upper limitofmovement and the skip 11 its lower limit of movement. At the sametime, the traveling nut -58 approaches its right hand limit of movement.

The tapered end of nut 58 now raises switches 44 and 45 successively.The

lifting. of the switch 44 breaks the circuit for the solenoids 36 to 39inclusive, thus deenergizing all solenoids which rema ned denergizessolenoid 27, thus causing the openin of auxiliary switch 27 and causingswitch 23 to move to its middle or ofi position and interrupting thesupply of current to motor 20 The interruption of this in supply ofcurrent causes the deenergization of the solenoid 66, and the setting ofthe brake 64.

The motor 20 and the two skips now stop, the skips 10.and 11 having nowreached their upper and lower limits respectively. The skip 10. inapproaching this upper limit has tipped to dumping position, the wheelson its front axle having followed the curve at the upper end of the maintrack 12 and the auxiliary wheels on its rear axle having followed theauxiliary track 18. The material is thus dumped from the skip into thereceiving bin 89. The arm 74 of the skip 11, as the latter hasapproached its lower limit of movement, has engaged the finger 73 andswung the bin gate 70 to open position, whereupon the supply bin 71,unless empty, immediately begins to discharge material into the skip 11.When the skip 11 is filled with a predetermined load, the finger/73 isagain released from the latch 76 and the bin gate 70 again swingsclosed. At the end of this closing movement, the finger 68 engages thenext tooth of the ratchet wheel 60, and swings it and the masterdirection switch 54 forward to the next position. This brings thecontact 90 of said switch into operation, and completes a circuit whichextends from one side of the line 83 through contact 90 of switch 54,conductor 9l, reversing switch 46, conductor 104, switch 42, solenoid26, conductor 88, switches 41 and 40 to the other side of the line 83..The resultant energization of the. solenoid putting the solenoids 36 to39 inclusive under the control of the switch 43, completmg the prlmarycircuit 'of motor 20 for operatlon in the opposite direction from thatabove described, and releasing the brake 64.

The motor 20 now starts in such opposite direction, raising skip 11,lowering the skip 10, and moving thev traveling nut 58 to the v53 left.As this movement of the nut 58 continues swit ches 45 and 44 are droppedin succession and the resistance sections 28, 29',

26 causes switch 23 and aux-' 111ary switch 26 to close to the right,thus.

switches 44 and 45 as the nut 58 approached its right hand limit, asalready described. The skip '10, which is now' approaching the bottom,opens the bin gate in the last part of its downward movement. From thispoint the cycle above described is repeated continuously as long as anymaterial is left in the supply bin 71, then it automatically stops.

Considerable energy is required to start the movement of the skips, andconsiderable energy must be disposed of in order to stop such movement.The following scheme is provided to take care of this economically.Located between the rails of the'track 12 at the bottom is a hook 92,which can slide in suitable guide rails lengthwise of the track 12. Thishook extends upward from the track into the path of some suitableprojecting part of the skip, such as one of the axles or a hook 93firmly fastened to the body of the skip. The sliding hook 92 is attachedby a sturdy cable 94 to a circular sheave 95, the cable 94 extendingover one or more pulleys 96 to a convenient location for such sheave 95.The circular sheave 95 is mounted on the same shaft or otherwise firmlyconnected to a spiral sheave 97, on the periphery of which is a cable 98attached to a heavy weight 99. When either skip approaches the end ofits downward movement, the hook 93 on such skip engages the sliding hook92 and swings the cable 98 around the spiral sheave 97 thus raising theweight 99 and storing energy in it. Be-

cause of the spirality of the sheave 97, the

weight 99 is started on its downward movement comparatively slowly, andgradually increases in speed. In other words, the mechanical advantageof the skip on the weight is decreased as the weight moves upward. Theweight thus assists in bringing the skip to a standstill, this actionbeing effected because of the spiral sheave 97 without any violent jerkson the mechanism or any undue strains on the cables 94 and 98.

The energy stored in the lifted weight 99 is returned to the skip whenthe latter starts on its upward movement, thus releasing the motor 20 ofsome of its starting load. The rate at which this energy is returned tothe skip is a gradually decreasing one, thus relieving the starting loadon the motor 20 mostly at the beginning of the movement of the latterand gradually decreasing as the motor and skips gain in speed and theextra starting load diminishes.

If at any time during the operation of the system, the operator desiresto take control, he mdy'do so by manipulating the master switch 40 orauxiliary switch 41. If the skipsare at their of movement,

and the traveling nut 58 is at one of itslimits of movement, the motormay be directions of movement, for, by the use of the reversing switch46, the "movements of the skips may be stopped atany point in theirupward and downward movements and reversed at will. If the motor isinmotion and it is desired to stop the skips, the master switch 40 ismoved to off position, thus breaking the circuits for the solenoids 36,37, 38, and 39, and solenoid 26 or 27, whichever one is energized. Thisinter-' 'rupts all the normal control circuits and the resultant openingof the reversing switch 23 interrupts the primary circuit of the motorand causes the setting of brake 64.

- However, if it' is desired to stop the operation of the system at anytimefor any rea son whatsoever, it is not necessary to be at the mainoperating stand to open the master switch 40, for the desired result maybe accomplished by opening any one of the emergency switches 41. Byopening any one of the switches 41 the cutting of the sections ofresistance into the secondary circuit of the motor is first caused, andthen the reversing switch 23 is caused to moveto its open position,cutting OK the current supply to the motor 20. When it is desired toagain start up the system, switch 40, if it has been opened, maybeclosed, blade 47 first coming into engagement with contact 48 foroperating switch 23' to connect motor 20 to its supply circuit 21 andthen blade 47 engaging blade 49 for caus- 'ing the gradual cutting outof sections of resistance from the secondary circuit of motor 20. If themaster switch has remained closed and either one of the emergencyswitches has been opened, the emergency switch which has been opened maybe closed, contact 41 of said switch first engaging the elongatedcontact 41 for closing the reversing switch 23 for connecting motor'20to its'supply circuit, and thencontact 41 engaging its correspondingcontact for causing the gradual cutting out of the sections ofresistance in the rotor circuit of the motor 20. When once started thesystem will at once take up and continue the automatic operation alreadydescribed,

the parts automatically stopping when they reach their limits ofmovement and starting again when the skip at the bottom becomessufliciently loaded. v

NVith the arrangement which I have here provided it is not necessarythat the skip at the bottom becomes loaded to a predetermined amountbefore the bin gate can be closed with the resultant actuation of themaster direction switch 54 for making connections for the skip at thebottom to move upward. If it is desired to close the bin gate 70 beforethe skip at the bottom has received its regular load of a certainpredetermined weight, a push button 105 may be operated, completing acircuit from one side of the line 83 through push button switch 105,conductor 106, solenoid 107,,to the other side of the supply circuit 83.The resultant energization of coil 107 will draw core 108 with its lever109 downwardly, removing the latch 7 6 out of engagement with the finger73 of the bin gate, permitting weight 72 on the arm 69 to close the bingate and move the master direction switch to its next forward positionfor causing the upward movement of the skip at the bottom and thedownward movement of the skip located above.

The master switch 40, reversing switch 46, and'push button switch 105are preferably located at the main operationstation where ton controlswitch 105 all located at the central point of operation, manual controlat such point isrendered convenient, and with the emergency switches 41located at different points in the system manual con- 'the operator mayoperate any of these trol is provided for bringing the system to a stateof rest and for again starting said system when it is so desired. Shouldthe parts already described get out of order' or fail to work for anyreason, it is possible that the motor will overwind the cable 13 on thedrum 14, which might even break the cable. In order to take care ofthis, a latch 112 is placed in the path of each of the bails 15 slightlybeyond the normal upper limit of movement thereof. In case ofoverwinding,,the bail 15 strikes the latch 112 and mbves it in acounter-clockwise direction. This snaps open 4 the switch 113 in theemergency control circuit, which is that of the holding solenoid 25 ofthe circuit-breaker 22, thus causing the tripping of suchcircuit-breaker and the breaking of the circuit of the motor 20. Thisstops the motor. In order to prevent the skip at the top of the hoistfrom falling in case the cable has been broken by the overwind, thelatch 112 at-once automatically swings back beneath the cross bars ofthe bail 15. If the skip starts to drop,

this latch will therefore catch the bail and prevent such dropping.

If the cable 13 breakswhile the system 'is m operation, both skips mayfall to the bottom of the hoist, the first skip to reach the bottomwouldv open the bin gate 70 and would probably be traveling with so muchmomentum that due to the impact on the scale platform it would. raisethe balance beam 77 sufficiently to open a snap switch 114. This switch114 is also in the emergency control circuit, or that of the solenoid 25, and its opening produces the same results as those produced by theswitch 113. The disposition of the switch-114 relative to theWeightedbeam 77 is such that ordinary operation of the beam due to theweight of a loaded skip, is not capable of causing actuation of theswitch to open position. The nest of springs 80 is for the purpose ofpreventing the lesser impacts occurring in the ordinary operation of thesystem, from tripping the latch 76 and the switch 114, for absorbing thelast of the momentum of a descending skip, and for giving an ascendingskip a kick at starting.

Should the voltage of themain supply circuit 21 fail for any reasonwhile the motor is in operation, the solenoid 66 is immediatelydecnergized. This causes the setting of the brake 64. If the voltage ofthe con trol and supply circuit 83 fails. for any reason while the motoris in operation, all of the control circuits will be denergized. Thiscauses the resistance in the rotor circuit of the motor to be cut in,andthe primary circuit of the motor to be broken both at the reversingswitch 23 and the circuitbreaker 22. c"

Any suitable protective means may be provided for protection against theoverloads. In case of an overload in the arrangement illustrated, aseries relay 115 opens the circuit of the solenoid 25 and thus causesthe opening of the circuit-breaker 22. In some cases the circuit-breaker22 may be dispensed with and .the switches 113, 114, and 115 put in someother suitable circuit.

Broad features of the invention described herein are claimed in myco-pending application Serial No; 633,798, filed June 17, 1911, whichhas matured into Patent No. 1,207,983, Dec. 12, 1916. Further, certainfeatures relating to the operation and con- ,'.trol of the hoist systemof'this application cation.

are introduced in my co-pending application Serial No. 123,788, filedOct. 2, 1916, and my co-pend-ing application Serial No. 140,640, filedJan. 2', 1917, the latter application being a division of the presentappli I have described my hoisting system in what I now consider to beits preferred i form. There may be various modifications andarrangements other than those here particularly shown and descrrbed, andI aim to cover all such modifications and arrangegate to cause saidments of my invention which do not depart the material in the car forcontrolling the closing of the bin gate, and means operated by theclosing of the bin gate for causing said power operated device to hoistthe car.

2. A hoisting apparatus comprising-a car to be hoisted, an electricmotorfor hoisting it, a bin from which material to be hoisted is supplied tothe car, said bin having a bin gate for controlling the supply ofmaterial to the car, means for causing the closing of the bingate whenthe material in the car reaches a predetermined weight, means forcontrolling the closing of the gate independent of the weight of thematerial in the car,

. and means operated by the closing of the bin gate for causing themotor to be connected to hoist the car, p

3. A hoisting apparatus comprising a car,

.a power operated device for raising and lowering said car, a bin fromwhich material is supplied to the car when at the bottom of its travel,said bin having a gate which is automatically opened when thecarreachesthe bottom of its travel, means for causing the closing of said gatewhen the weight of thematerial supplied to said car has reached apredetermined value, means for'controlling the closing of said gateindependentof the weight of material supplied to said car, and

means operated bythe closing of the bin power operated device to raisethe car. I g

4. A hoisting apparatus comprising'a car, a power operated device, forraising and lowering said'car, a bin from which material is supplied tothe car when at the bottom of its travel,-said' bin having. a gate whichis automatically opened when the car reaches the 'bottom of its travel,means for causing the closing of'said gate when the weight of thematerial supplied to said car has reached a predetermined value, meansfor controlling the closing of said gate independent of the weight ofthe material su plied to said ear, means operated by the, closing of thebin gate tocause the power operated device to raise the car, and meansfor causing the power operated device tojstop raising the car when thelatter reaches the top of its travel.

5. In a hoisting apparatus comprising a car, an electr c motor forralsmg and lowering said car, a bin from which material is supplied tothe car vwhen at its lower limit of movement, said bin having a gatewhich is for controlling the closing of said bin gate 1 independent ofthe weight of the material in the car, and means operated by the closingof the bin gate for causing the completion of the motor circuit in theproper direction to cause it to raise the car.

a 6. A hoisting apparatus comprising a car, an electric motor forraising and lowering said car, a bin from which material is sup plied tothe car when at its lower limit of movement, said bin having a gatewhich is automatically opened by the car as the latter approaches itslower limit of movement, means for causing the closing of said bin gatewhen the weight of the material in the car reaches a predeterminedvalue, means for controlling the closing of said bin gate independent ofthe weight of the material in the car, means operated by the closing ofthe bin gate for causing the completion of the motor circuit in theproper direction to cause it to raise the car, and means for stoppingsaid electric motor when the car reaches its upper limit of movement.

7. In combination, a car which is movable between two limits ofmovement, a power opera-ted device for moving the car between saidlimits of movement, a bin from which material is supplied to the carwhen the latter is at one limit of its movement, said bin having a gatewhich is opened by the car as the car reaches its limit of movement,means for causing the closing of the bin gate when the weight of thematerial supplied to the car has reached a predetermined value, separatemeans for controlling the closing of the bin gate, and means controlledby the closing of said bin-gate to move said car toward the other limitof its movement.

8. Incombination, a car which is movable between two limits of movement,a power operated device for moving the car between said limitsof'movement, a bin from which material is supplied to the car when thelatter is at one limit of its movement, said bin having a gate which isopened by the car as the latter reaches its limit of movement,

means for causing the closing of the bin gate when the weight of thematerial supplied to said car has reached a predetermined value,separate means for controlling the closing of the bin gate, meanscontrolled by the closing of said bin gate for causing the I said poweroperated device to move said car toward the other limit of its movement,and means for stopping said car when it reaches said other limit of itsmovement.

between two limits of movement, an electric motor for moving said carbetween said hm- .--its of movement, a'bin from which material issupplied to said car when it is'at one limit of its movement, said binhaving a gate which is opened by the car as it approaches its limit ofmovement, means for causing the closing of said bin gate when the weightbf the material supplied to the said car able between two limits ofmovement, an

electric motor for moving said oar between said limits of movement, abin from whlch material is supplied to said car when it is.

at onelimit of its movement, said bin having a gate which is opened bythe car as it approaches its limit of movement, means for causing theclosing of said bin gate when the weight of the material supplied tosaid car from said bin has reached a predetermined value, other meansfor controlling the closing of said bin gate, means operated by theclosing of the bin gate for causing current to be supplied to said motorto cause it to move the car toward the other limit of movement, andmeans for stopping said mo tor when said car has reached said otherlimit of its movement.

11. In a skip hoist, the combination of two skips, a poweroperateddevice for moving said skips oppositely between upper and lower limitsof movement, a bin from which material is supplied to the skip at thelower limit of its movement, said bin having a gate which controls thesupply of said material to said skip and is opened automatically when askip approaches the lower limit of travel, means causing the closing ofsaid gate whenthe weight of the material the skip at the bottomand lowerthe skip at the top.

12. In a skip hoist, the combination of two skips, a power operateddevice for moving said skips oppositely between upper and of said bingate when the weight of material supplied to the skip at the bottom hasreached a predetermined value, means for controlling the closing ofsaid-bin gate in- I dependent of the weight of the material supwhen askip approaches the lower limit of travel, means for causing the closingof said bin gate when the weight of the material supplied to the skip atthe bottom has reached a predetermined value, means for controlling theclosing of said bin gate independent of the weight of the materialsupplied to the skip, means operated by the closing of the bin gate forcausing said power operated device to raise the skip at the bottom andlower the skip at the top, and means for stopping the movement of saidskips by said power operated device when the position of the skips withrelation to their llmits of movement has been reversed.

14. In a skip hoist, the combination of two skips, a power operateddevice'for moving said'skips oppositely between upper and lower limitsof movement, a bin from which material is suppliedto the skip at thelower limit of its movement, said bin having a gate which controls thesupply of material to said skip, means for causing the closing of saidbin gate when the weight of thematerial supplied to the skip at thebottom has reached a predetermined value, manually operated means forcontrolling the closing of said bin gate, means operated by the closingof the bin gate for causing 'sald poweroperated device to raise the skipat the bottom and lower the skip at the top, and means for stopping themovement of said skip by said power operated device when the osition ofthe skips with relation to their llmits of movement has been reversed.

15. In a ski hoist,'the combination of two skips, an e ectric motor forraising and lowering said skips, the simultaneous movement of the twoskips being in opposite directibns, a' bin from which material to behoisted is supplied to the skip at the bottom, said bin having a gateWlllCh controls the supply of material to the skip at the bottom and isautomatically opened as either skip approaches the bottom, means forcausing the closing of the bin gate when the load in the skip at thebottom reaches a predetermined value, means for controlling the closingof the bin gate independent of the. load 1n the sklp, and a switchoperated by the closing of the bin gate'for controlling the operation ofsaid electric motor.

16. In a skip hoist, the combination of two skips, an electric motor forraising and lowering said skips, the simultaneous movement of the 'twoskipsbeing in opposite directions, a bin from which material to behoisted is supplied to the skip at the bottom, said bin having a gatewhich controls the supply of material to the skip at the bottom, meansfor causing the closing of the bin gate when the load in the skip at thebottom reaches a predetermined value, means for controlling the closingof the bin gate independent of the load in the skip, and a switchoperated by the closing of the bin gate and controlling the operation ofsaid electric motor.

17. In a skip hoist, the combination of two skips, an electric motor forraising and lowering said skips, the simultaneous movement of the twoskips being in opposite directions, a bin from which material to behoisted is supplied to the skip at the bottom, said bin having a gatewhich controls the supply of material to the skip at the bottom and isautomatically opened as either skip approaches the bottom, means forcausingthe closing of the bin gate when the the closingof the bin gateindependent of load in the skip at the bottom reaches a Y predeterminedvalue, means for controlling the load in the skip at the bottom, aswitch operated by the closing of thebin gate and controlling theoperation of said electric motor, and means for stopping the operationof the skips by. the motor when the skips reach their limits ofmovement,

18. In combination,-a movable car, a bin means operated by the car foropening thev bin, means controlled by the weight of material supplied tothe car for closing the bin, means for controlling the closing of thesaid bin independent of the weight of the material supplied to the car,means controlled by the closing of the bin for starting the car,

and means controlled by the movement of the car for stopping the car.

20. In-comb1nation, a movable car, a bin from which-material is'supplied to the car,

means operated by the car for opening the.

bin, manually controlled means for controlling the closing of said bin,and means operated by the closing of the bin for control ling the car. I

21. In combination, a movable car, an electric motor for operating it, agate through which material is supplied to said car, man ually operatedmeans for controlling the closing of said gate, and means controlled bysaid gate for controlling said motor.

22. The combination of a skip, a bin from which material is supplied tothe skip, said bin having a gate, manually controlled means forcontrolling the closing of said bin gate, and means controlled by theclosing of the bin gate'for controlling the operation of the skip.

23. The combination of a pair of skips movable between two limits ofmovement, a bin from which material is supplied to a skip when it is atone limit of its movement, said bin having a gate for controlling thesupply of material to a skip, manually operated means for controllingthe closing of said bin gate, and means controlled by alternate closingsof the gate for producing opposite operations of the skips.

24;. The combination of a pair of skips movable between two limits oftravel, an electric motor for operating said skips, a bin from whichmaterial is supplied to a skip when it is at one limit of its travel,said bin having a gate which controls the supply of material to a skin.means controlled by'the weight of material supplied from the bin to askip for causing the closing of the gate when such weight has reached apredetermined value, means for controlling the closing of said gateindependent of the weight of material supplied from the bin, and meanscontrolled by alternate closings of said gate for causing oppositeoperations of said motor.

25. The combination of a pair of skips movable between two limits oftravel, an electric motor for operating said skips, a bin from whichmaterial is supplied to a skip when it is at one limit of its travel,said bin having a gate which controls the supply of material to a skip,manually controlled means for causing the closing of said bin gate, andmeans controlled by alternate closings of said gate for causing theopposite operations of said motor.

26. The combination of a pair of skips, an electric motor for operatingsaid skips,

' a reversing switch for said motor, a gate controlling the supply ofmaterial to said skips, manually controlled means for causing theclosing of said gate, and means controlled by alternate closings of saidgate for causing opposite closings of said reversing switch.

27. In combination, a pair of skips, an

electric motor for-oppositely reciprocating them between two limits ofmovement, a re- .versing switch for the motor, a gate through whichmaterial is supplied to each of the skips when it is at one limit of itsmovement, means independent of the skips for said reversing switchoppositely upon alternate closings-of said gate.

29. In combination, a pair of skips, an electric motor for oppositelyreciprocating them between two limits of movement, a reversing switchfor the motor, a gate through which material is supplied to each of saidskips when it is at one limit of its movement, means independent of saidskips for controlling the closing of said gate, means controlled by saidgate for elosing'the reversing switch oppositely upon alternate closingsof said gate, and means for causing the opening of said reversing switchwhen the skips reach their. limits of movement.

30. In combination, a skip, an electric motor for reciprocating saidskip between two limits of movement, a reversing switch for the motor, agate through which material is supplied to said skip when it is at onelimit of its movement, means independent of the skips for controllingthe closing of said gate, means controlled by the closing of the gatefor causing the closing of said reversing switch, means forautomatically accelerating said skip upon the closing of said reversingswitch, and means for first automatically decelerating the skip and thencausing the opening of the reversing switch as the skip approaches alimit of its movement.

e 31. In combination, a skip, an electric motor for reciprocating saidskip between two limits of movement, a reversing switch for the motor, agate through which material is supplied to said skip when it is at onelimit of its movement, means independent of the skips for controllingthe closing of said gate, means controlled by the closing of the gatefor causing the closing of said reversing switch, means forautomaticallyaccelcrating said skip upon the closing of said reversing switch, andmeans for causing the opening of the reversing sw1tch as the slapapproaches a limit of its movement.

32. In combination, a car movable between two limits of movement, anelectric motor for operating said car, means for automaticallycontrolling said motor to cause it to reciprocate said car between saidlimits of :i go

movement, automatically operated means for controlling said motor toproduce an operation of said car between the same limits of movement,and means for reversing the action of said controlling means.

33. In combination, a car movable between two limits of'movement, amotor therefor, a gate controlling a supply of material to said car whenat one limit of its movement, means independent of said car for causingthe closing of said gate, means operated by the closing of said gate forcausing the motor to reverse the car to move toward the opposite limitof its movement, means controlled by the movement of the motor forstopping the car when it reaches the opposite limit of its movement, andmeans for reversing the effect of said reversing means.

34. In combination, a car movable between predetermined limits ofmovement, a gate through which material is so plied to the car when atone of its limits 0 movement, a motor for operating said car, areversing switch for the motor, means independent of the car for causingthe closing of said gate, means operated by the'c'losing of said gatefor causing the closing of said reversing switch in the proper directionto move the car toward the other limit of movement, and means controlledby the movement of the car for stopping such movement when such otherlimit of movement is reached.

35. In combination, a skip, means for actuating said skip, a bin fromwhich material is supplied to said skip, means operated by the carcontrolling the bin, means 0 erated by the closing of the bin forcontrolling the car, and means associated with said last mentioned meansfor reversing the eflect thereof.

36. In combination, a skip operating between limits, means for'normallyreversing the skip when it hasreached one of its limits, and means forreversing at will the efi'ect of said last mentioned means.

37. In combination, a skip operating be tween limits, a direction switchautomatically operated when the skip it at one limit, and manuallyoperated means for reversing the effect of said direction switch.

38. In combination, a skip operatingbetween limits, 3. direction switchautomatically operated when the skip is at one limit, manually operatedmeans for reversing the effect of said direction switch, and means forstopping and starting said skip irrespective of its position.

39. In combination, a skip operating between limits, adirection switchadapted to be operated when the skip is at one limit, manuallycontrolled means for controlling the operation of said direction switch,and manually operated means for reversing the effect of said directionswitch.

40. In combination, a ski tween limits, a direction switch adapted to beoperated when the skip is at one limit, manually controlled means forcontrolling the operation of said direction switch, manually controlledmeans for reversing the effect of said direction switch, and means forstopping and starting said skip irrespective of its position.

41. In combination, a movable car, a gate through which material issupplied to said car, a direction switch operated automatically by theoperation of said gate, manually controlled means for causing a movementof said gate to operate said direction switch, and manually controlledmeans for reversing the efi'ect of said direction switch, all ofsaid'manually controlled means being located at a single control point.

42. In combination, a skip, a motor for controlling the operation ofsaid skip, a gate for controlling the discharge of material to operatingbesaid skip, control means for said motor for eiiecting the operationthereof in either direction, an operative connection between said gateand said control means, said'gate being operative for motor controlpurposes in response to the weight of material in said skip, andauxiliary means operable at the will of an operator for causing 'suchoperation of said gate as is efiective to'control the operation of saidmotor.

Milwaukee, Wis, April 30, 1912.

In testimony whereof I aflix my signature, in the presence oftwowitnesses.

RAY C. NEWI-IOUSE:

